Tool for removing insulation from wires.



H. PRAGK. TOOL FOR REMOVING INSULATION FROM wmns.

APPLICATION IILED AUG.26, 19il1.

Patented Mar. 12, 1912.

COLUMBIA FLANOGRAPH co., WASHINGTON. D c.

HENRY PRACK, OF OTTAWA, ILLINOIS.

TOOL FOR REMOVING INSULATION FROM WIRES.

Specification of Letters Patent.

Patented Mar. 12, 1912.

Application filed August 26, 1911. Serial No. 646,257.

To all whom it may concern:

Be it known that I, HENRY PRACK, a citizen of the United States,residing at 515 Vest Superior street, city of Ottawa, county from wires.

The object of my invention is the production of a tool of the charactermentioned which will be of durable and economical construction and ofhigh efliciency in use.

Other objects will appear hereinafter.

\Vith these objects in view, my invention consists in a stripping toolcharacterized as above mentioned and in certain details of constructionand arrangements of parts, all as will be hereinafter more fullydescribed and particularly pointed out in the appended claims.

My invention will be best understood by reference to the accompanyingdrawing forming a part of this specification and in which,

Figure 1 is a perspective view of a wire stripping tool embodying myinvention, F ig. 2 is a slightly enlarged transverse section takenthrough the jaws of the tool with said jaws in closed or operativeposition.

The preferred form of my construction as illustrated in the drawingcomprises a pair of levers 1 which are pivotally connected at 2. Thelonger ends of said levers 1 are designed to constitute handles, theopposite ends thereof being formed with registering similar jaws 3 whichare formed integral with said levers. Each of the jaws 3 comprisesparallel transversely extending side bars 4. The inner sides of the bars4 at the inner edges thereof are beveled, as clearly shown in Fig. 2, toserve as a means of centering the wire being stripped between the jaws3, the beveled inner sides of said lateral bars engaging the oppositesides of the wire holding the latter central. Provided centrally betweenthe bars 4 is a similar knife edged bar 5 which is disposed parallelwith the bars 4, the knife edge of the bar 5 being disposed, as clearlyshown in Fig. 2, slightly below the plane of the knife edges of the bars4. Corresponding ends of the bars 1 and 5 are connected by semi-circularplates (3 which are formed integral therewith, the inner or straightedges of said plates being also sharpened so as to constitute the samecutting edges. The cutting edges of said plates 6 are provided centrallywith semicircular recesses 7, the recesses 7 in corresponding plates ofthe respective jaws 3 bemg positioned for registration so that when saidjaws are closed said recesses together will form a circular openin Theplates 6 are so positioned relative to the recesses 7 that the cuttingedges of the former register with the bottoms of said rece ses, asclearly shown in Fig.

In using a tool constructed as above set forth, the wire to be strippedis first arranged between the jaws 3 to extend longitudinally of thelatter so that said jaws will contact with the particular portion of thewire from which it is desired to remove the insulation. \Vhcn sopositioned the bandles of the levers l are pressed together causing theforcing of the jaws into engagement with the covering or insulation ofthe wire. In this operation the cutting edges of the plates (3 and ofthe bars 5 pierce the insulation, the former severing the sametransversely and the latter longitudinally, so that when the tool isrotated slightly the insulation gripped thereby will be loosened fromthe wire and removed by the jaws 3 when the same are opened. Theprovision of the recesses 7 affords clearance for the wire which ispositioned axially within the insulating covering so that when the jaws3 are forced into engagement with the insulation covering, the wirepositioned therein will not be severed. By arranging the cutting bars 5with their cutting edges positioned as stated the latter, when the jaws3 are forced together, will pierce the wire insulation extending throughthe same into close proximity with the axial wire, not to such an extentas to pierce the wire. The arrangement of the bars 1 and 5 affordsopenings or interstices between the same, such openings or intersticespermitting of ready cleaning of the jaws after use. Such construction isof great advantage, since wires not infrequently are covered with pitchor a semi-fluid insulation which when the jaws of a tool are forced intoengagement therewith, adheres thereto with great tenacity. stated anypitch or other substance which might adhere thereto may be readilydislodged and the jaws thus readily maintained in proper condition foruse.

A stripping tool of the construction set fort-h is durable andeconomical and the same is of high efliciency-in operation.

lVhile I have illustrated and described the preferred form ofconstruction for carrying my invention into effect, the same is capableof variation and modification without de parting from the spirit of theinvention. I, therefore, do not wish to be limited to the precisedetails of construction set forth, but wish to avail myself of suchvariations and modifications as fall within the scope of the appendedclaims.

Having described my invention, What I clainras new and desire to secureby Letters Patent, is:

1.- In a tool for removing insulation from wires, a pair of pivotallyconnected jaws, each of said jaws comprising two parallel side barshaving beveled inner edges; a central knife edged bar disposed parallelwith said side bars and having its cutting edge disposed below thecorresponding edges of said side bars; and end plates connecting saidbars and having recesses provided centrally in the inner edges thereof,substan tially as described.

2. In a tool for removing insulation from wires, a pair of pivotallyconnected jaws, each of said jaws comprising two parallel side barshaving beveled inner edges; a central longitudinal knife edged bardisposed parallel with said side bars and having its cutting edgedisposed below the corresponding edges of said side bars; and end platesconnecting said bars, said end plates having knife edged inner edgeshaving recesses provided centrally therein, said bars and plates Byconstructing the jaws as.

being formed integral, substantially as described.

3. In a tool for removing insulation from wires, a pair of pivotallyconnected jaws, each of said jaws comprising two parallel side bars theinner sides of said bars at the inner edges thereof being beveled, acentral longitudinal knife edged bar disposed parallel with said sidebars and having its cut ting edge disposed below the corresponding edgesof said side bars; and substantially semi-circular end plates connectingcorresponding ends of said bars, the inner edges of said end platesbeing sharpened, and provided with semi-circular recesses, the cuttingedges of said medial bar being in registration with the bottoms of saidrecesses, there being interstices between said bars, substantially asdescribed.

4. In a tool for removing insulation from wires, a pair of pivotallyconnected levers; registering jaws carried at corresponding ends of saidlevers, each of said jaws comprising two parallel side bars the innersides of said bars at the inner edges thereof being beveled; a centralknife edged bar disposed parallel with said side bars and having itscorresponding edge disposed below the cutting edges of said side bars;and substantially semi-circular end plates connecting corresponding endsof said bars, the inner edges of said end plates being sharpened andprovided centrally with semi-circular recesses, the cutting edges ofsaid medial bar being in registration with the bottoms of said recesses,substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HENRY PRACK.

Witnesses:

THERESA J. BUTLER, NELLIE KELLY.

Copies of this patent may be obtained for five cents each, byaddressing; the Commissioner of Patents, Washington, D. G.

